Heat Gain from Electrical Motors in Continuous Operation

Amount of heat transferred from electrical motor to ambient room vs. locations of fan and motor.

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Electrical motors in air condition systems contributes to the heat loads in air condition systems and will influence on the dimensions of cooling equipment.

Heat gain from electric motors in fans

Heat loads from electrical motors and fans in different locations can be estimated from the table below:

Shaft Output (kW)	Full Load Electrical Motor Efficiency - η - (%)	Electrical Motor Input (kW)	Location of Fan and Motor
Shaft Output (kW)	Full Load Electrical Motor Efficiency - η - (%)	Electrical Motor Input (kW)	1 Motor and Fan in the Inlet Air Flow or in the Room (kW)	2 Motor Outside the Air Flow or Outside the Room. The Fan in the Inlet Air Flow or in the Room (kW)	3 Motor in the Room. The Fan in the Outlet Air Flow (kW)
0.05	40	0.13	0.13	0.05	0.08
0.07	46	0.15	0.15	0.07	0.08
0.10	55	0.18	0.18	0.10	0.08
0.14	60	0.23	0.23	0.14	0.09
0.20	64	0.31	0.31	0.20	0.11
0.28	66	0.42	0.42	0.28	0.14
0.40	70	0.60	0.60	0.40	0.20
0.56	72	0.78	0.78	0.56	0.22
0.80	76	1.05	1.05	0.80	0.25
1.1	80	1.38	1.38	1.1	0.28
1.6	80	2.0	2.0	1.6	0.40
2.5	81	3.1	3.1	2.5	0.60
4.0	82	4.9	4.9	4.0	0.90
5.6	84	6.7	6.7	5.6	1.1
8.0	84	9.5	9.5	8.0	1.5
11.2	86	13.0	13.0	11.2	1.8
16	87	18.4	18.4	16	2.4
20	88	22.7	22.7	20	2.7
25	89	28.0	28.0	25	3.0
32	89	36.0	36.0	32	4.0
40	89	45.0	45.0	40	5.0
50	90	56.0	56.0	50	6.0
63	90	70.0	70.0	63	7.0
80	90	89.0	89.0	80	9.0
100	91	110	110	100	10.0

1 kW = 1000 Watts = 3412 Btu/h = 737.6 / 550 British hp = 1.341 British hp = 10³/9.80665 kg_f m/s = 737.6 ft lb_f/s = 10³/(9.80665 75) metric hp

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Heat Gain from Electrical Motors in Continuous Operation

Amount of heat transferred from electrical motor to ambient room vs. locations of fan and motor.

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